基于声模态分解的风扇叶盘同步振动辨识

doi:10.7527/S1000-6893.2022.27066

Abstract

Abstract:

It is important to apply the non-contact and non-invasive approach to the vibration measurement of aero-engine blisks in aero-engine development， experiments and safety operation. An acoustic mode decomposition based approach is proposed to realize the identification of synchronous vibration of the blisk. The run-up and run-down experiment of a three-stage fan test rig is conducted， where the ring microphone array is placed at the inlet duct and several strain gauges are glued on the rotor blade. The Blade Passing Frequency （BPF） of the acoustic pressure signal is analyzed with respect to the rotational speed. With the mode decomposition at BPF and the Campbell diagram， the mapping relationship between the dominant mode order and the nodal diameter number of the blisk is established. The results of acoustic and vibration tests show that the resonance of the blade occurs when the number of the dominant mode order equals to the nodal diameter number of the blisk， where the proposed approach can effectively identify the synchronous vibration parameters of the blisk； the rotor blades have interacted with both the forward and backward rows of stator vanes， where the generated acoustic modes hold broadband characteristics and the mode scattering phenomenon occurs， leading to the multi-modal vibration of the rotor blade； the acoustic pressure can sensitively mirror different modes of blade vibration， and hence can be employed for the non-contact and non-invasive measurement of the aero-engine vibration.

Key words: microphone array, acoustic mode decomposition, Campbell diagram, synchronous vibration, rotor?stator interaction, dynamic stress

CLC Number:

V232.4

Bi WEN, Baijie QIAO, Zepeng LI, Zhendong LI, Yanfeng WANG, Xuefeng CHEN. Synchronous vibration identification of fan blisk based on acoustic mode decomposition[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2023, 44(6): 227066-227066.

Figures/Tables 21

Fig. 1

Fig. 2

Table 1

Fig. 3

Fig. 4

Table 2

Number of first rotor-stator assembly and inlet guide vanes

叶片类别	数量
支板叶片IGV- $S 1$	V₁=17
一级转子叶片 $R 1$	B=22
一级静子叶片 $S 1$	V₂=15

Table 2

Fig. 5

Fig. 6

Fig. 7

Fig. 8

Table 3

Dominant strain amplitudes at point A and corresponding engine orders

激励阶次	峰值转速/（r·min^-1）	峰值频率/Hz	振幅/ $10 - 6$
17	4 560	1 292.1	636.1
	6 795	1 925.3	187.2
	7 487	2 121.5	139.9
34	6 648	3 767.4	103.8
	8 188	4 640.2	103.2
	8 470	4 799.7	93.9
	10 293	5 832.7	104.3
51	6 801	5 781.4	305.9

Table 3

Fig. 9

Fig. 10

Table 4

Dynamic strain amplitude of point B and point C with engine order 17

测点	激励阶次	峰值转速/（r·min^-1）	峰值频率/Hz	振幅/ $10 - 6$
B	17	4 566.0	1 293.7	712.0
		5 758.2	1 631.5	787.6
		7 497.4	2 124.3	629.5
		9 485.2	2 687.5	246.7
		10 724.0	3 038.5	243.2
C	17	5 758.2	1 631.5	185.6
		6 792.7	1 924.6	2 000.0
		10 719.0	3 037.1	364.9

Table 4

Table 5

Potential acoustic modes generated by interaction between rotor blades and stator vanes

模态数	$ς 1$ （S₀）	$h$ （R₁）	$ς 2$ （S₁）	m	EO
1	-1	0	1	-2	2
2	-2	0	2	-4	4
3	0	1	-2	-8	30
5	-1	1	-1	-10	32
6	0	1	-1	7	15
7	-1	1	0	5	17
8	-2	1	1	3	19
9	-1	2	-2	-3	47
10	-2	2	-1	-5	49
11	-2	2	0	10	34

Table 5

Fig. 11

Table 6

Fig. 12

Fig. 13

Table 7

Fig. 14

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设计参数	数值
进口空气质量流量/（kg·s^-1）	89
风扇最大半径/mm	399
主流轴向马赫数	0.67

转速/ （r·min^-1）	主要模态m	激励辨识	1st BPF峰值声压级/dB
4 500	5	B-V₁	133
5 525	5	B-V₁	132
6 550	5	B-V₁	134
7 675	-12	B-2V₁	133
8 880	-10	B-V₁-V₂	131
9 300	3	B-2V₁+V₂	135
10 580	3	B-2V₁+V₂	138

测点类型	EO	n	对应转速/（r·min^-1）
C	17	10	10 725
C	4	2	10 698

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Synchronous vibration identification of fan blisk based on acoustic mode decomposition

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Figures/Tables 21

References 22

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模态数	$ς 1$ （S₀）	$h$ （R₁）	$ς 2$ （S₁）	m	EO
1	-1	0	1	-2	2
2	-2	0	2	-4	4
3	0	1	-2	-8	30
5	-1	1	-1	-10	32
6	0	1	-1	7	15
7	-1	1	0	5	17
8	-2	1	1	3	19
9	-1	2	-2	-3	47
10	-2	2	-1	-5	49
11	-2	2	0	10	34

模态数	$ς 1$ （S₀）	$h$ （R₁）	$ς 2$ （S₁）	m	EO
1	-1	0	1	-2	2
2	-2	0	2	-4	4
3	0	1	-2	-8	30
5	-1	1	-1	-10	32
6	0	1	-1	7	15
7	-1	1	0	5	17
8	-2	1	1	3	19
9	-1	2	-2	-3	47
10	-2	2	-1	-5	49
11	-2	2	0	10	34

模态数	$ς 1$ （S₀）	$h$ （R₁）	$ς 2$ （S₁）	m	EO
1	-1	0	1	-2	2
2	-2	0	2	-4	4
3	0	1	-2	-8	30
5	-1	1	-1	-10	32
6	0	1	-1	7	15
7	-1	1	0	5	17
8	-2	1	1	3	19
9	-1	2	-2	-3	47
10	-2	2	-1	-5	49
11	-2	2	0	10	34